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NITED STATES PATENT OFFICE.

ERNEST O. FASOLDT, OF ALBANY, NEW YORK, ASSIGNOR OF ONE-HALF TO JOHN BOYD THACHER, OF SAME PLACE.

PRESSURE-REGULATOR FOR COMPRESSED-AIR MACHINES.

SPECIFICATION forming part of Letters Patent No. 485,578, dated Novernloerv 1, 1892.

Application filed May 5 1890. Serial No. 350,600. (No model.)

To all whom t may concern.-

Be it known that I, ERNEST C. FASOLDT, of the city and county of Albany, in the State of New York, have invented a new and useful Pressure-Regulator for Compressed-Air Machines, of which the following is a specification.

Hy invention relates to a device for automatically regulating the flow of compressed air from a principal receiver, wherein air under a high degree of pressure is contained, into an auxiliary receiver, wherein it is desirable to maintain a lower degree of pressure with a certain uniformity; and the object of my invention is to provide an apparatus for scientific and other purposes where a steady flow of air or other fluid is required to be maintained at a constant degree of pressure, the degree of pressure being adjustable to suit the purpose for which it may be required. This object I attain by the mechanism illustrated in the accompanying drawings, which are herein referred to and form part of this specification, and in which- Figure l is a front elevation of my apparatus with a portion of the air-compressing mechanism removed therefrom. Fig. 2 is a side elevation of the same. Fig. 3 is a plan View. Fig. 4 is an enlarged vertical section of the upper part of the auxiliary receiver. Fig. 5 is a like section of part of the principal receiver, and Fig. 6 is an enlarged horizontal section of the automatic stop-valve between the receivers.

As represented in the drawings, A designates an air-compressing pump, which may be made in any preferred form, whose piston is operated bymeans of a crank and pitman, which are omitted from the drawings as not forming part of this invention.v Said pump is attached to a frame 1, which also serves as a base for a principal receiver 2, which is connected to said air-pump by means of apipe 3 for conveying the air from said pump into said receiver. The latter is intended for the purpose of holding and retaining a volume of air in a highly-compressed condition, so as to operate as a feeder for the auxiliary receiver. The latter, which is designated by the reference-iigure 4 in the drawings, is connected to the principal receiver 2 by means of a pipe 5,

which is provided with an automatic stop- Valve 6,intermediate1y located between the two receivers. The pipe 5 is also provided with a stop-valve 7, which is manipulated by hand, and which is usually kept closed while the principal receiver is being charged and while the apparatus is not in active use.

The automatic stop-valve is provided with a stem 8, on whicha quick-threaded screw is formed, so as to produce the opening and closing movements of the valve by a slight rotative movement of said stem. On the outer end of the latter an arm 9 is secured, and said arm is connected by a rod 10 to a segmental arm 11, which is attached to a rock-shaft 12, journaled in a bracket 13, secured to the upper end of the auxiliary receiver. Said segmental arm is graduated on its upper edge to receive one end of a coiled spring 14, which is adapted to be shifted from one of said graduations to another, according to the pressure required to be maintained in the auxiliary receiver. The opposite end of the spring 14 is attached to the projecting end of the stem 8 or other fixed point, and said spring is provided for the purpose of operating the segmental arm 11 to effect the opening -movement of the stop-valve 6, and it is obvious that the effect of said spring upon the segmental arm can be relatively increased and diminished by changing the point of connection of said spring on said arm farther from and nearer to the center of the rock-shaft 12.

A flexible diaphragm 15 covers the upper end of the auxiliary receiver 4 and is there retained by a ange 16, to which the bracket 13 is attached, and said flange is bored to receive a loosely-tted piston 17, which bears upon the diaphragm 15. Said piston connects with a lever 18, fulcrumed to the bracket 13 and whose opposite end takes under a spur or arm 19 on the rock-shaft 12, so as to impart a rocking motion to said shaft in one direction in opposition to the strain of the spring 14. A pipe 20 is inserted in the auxiliary receiver for the purpose of conducting the air from the latter to the place where it is required for use. Said pipe is provided with a stop-cock 21 for the purpose of shutting 0E theow of air from the auxiliary receiver, and said pipe is also provided with a ICO nipple 22 for the purpose of attaching thereto a iiexible tubing, by Which the air from the apparatus may be conducted to any point Where it is required to be used.

An adjustable check-screw 23 is titted in a yoke 24, which spans over the lever 18, and is secured to the bracket 13. Said check-screw is provided for the purpose of limiting the rising movement of said lever, and thereby the valve 6 is prevented from being jammed on its seat in such manner that the spring 14 will be insufficient to effect the opening movement of said valve.

Pressure-gages 25 are attachedV to the receivers 2 and 4 for the purpose of indicating the pressure carried in said receivers.

Myapparatus operates in the following manner: A supply of air is compressed into the principal receiver 2 until a high degree of pressure is obtained therein, and this compressionA is preferably produced while the stop-valve 7 is closed. The spring 14 is inserted in thegraduation of the segmentalarm 11 correspondingto the pressure that is required for use. Then the stop-valvev 7 is opened to allow the air to flow from the principal receiver 2 into the-auxiliary receiver 4. The air entersthe latter in an expanded state, and consequently at a lower pressure than is maintained in the principal receiver. When the air in the auxiliary receiver has attained the required pressure, the diaphragm 15 Willbe bulged outwardly.` Thereby the piston 17 is raised to push up the free end of the lever 1S, whereby the rock-shaft 12 is partially rotated to cause the segmental arm 11 to swing up- Wardly,and the arm 9 will thereby be moved to eect the closing ot the stop-valve 6, so as to stop the iiow of air from the principal receiverto the auxiliary receiver. The apparatus is then ready for performing its-fu notions` automatically. As the air from the auxiliary receiver becomes attenuated by discharges therefrom, the diaphragm 15 will return to its depressed position, and thereby permit the spring 14 to edect the reopening of the stopvalve 6 to accomplish the recharging of the auxiliary receiver with air of the required pressure. This operation can be continued while the principal receiver contains sufficient air in a compressed condition to supply the auxiliary receiver with air at the reduced pressure required, after which the principal receiver must again be charged with the highly-compressed air.

This apparatus may remain charged with air t'or a long-time and be in condition forimmediate use when occasion requires.

What I claim as my invention, and desire to secure by Letters Patent,.is-

1. In a regulator for air-compressing machines, the combination, with a principal receiver 2 and an auxiliary receiver 4, which are connected by a pipe 5, provided with an automatic` stop-Valve 8, said auxiliary receiver having a iiexible diaphragm 15 fixed therein, an arm 9, attached. to saidstop-valve and connected to an arm 11, having a graduated upper edge, the arm 11 being secured to arockcrshaft 12, thelatter being connected withalever 1S, which is fulcrumedl to a fixture at the upper end of said auxiliary receiver, and a loosely-fitted piston 17, connected to said lever and fitted to bear upon said diaphragm, of a spring 14, fitted to be adj ustably connected to the arm 11, and an adjustable set-screw 23, ittedto take against the lever 18, whereby the rising` movement of the latter may belimited, as and for the purpose herein specified.

2. In a receiver for air-compressing machines, the combination, with a principal receiver 2, an auxiliary receiver1 4, a pipe 5, which connectssaid receivers together, an automatic stop-valve 8, fixed in said pipe, an arm 9secured to the stem of saidvalve and connected to an arm l1, having graduations in its upper edge, a rocker-shaft 12, to which the arm 11 is secured, a lever 1S, connected with said rocker-shaft and fulcrumed to a fixture at the upper part of said auxiliary receiver, and a loosely-fitted piston 17, connected to said lever and fitted to bear upon a fiexible diaphragm 15, fixed insaid auxiliary receiver, of a spring 14,.adjustably attachable to said graduated arm, as and for the purpose herein specified.

ERNEST C. FASOLDT. Witnesses:

WM. W. LOW, S. B. BREWER. 

